This is the AR-2 Automatic Reverse with Adjustable Delay from Circuitron.
Same as AR-1, but with adjustable delay to hold train at sensor before reversing. Adjustable delay from one second to over one minute. Can be connected to pushbutton or DT-4 to permit stops and delays without reversing. Requires 12-18V DC power supply. Constructed on 3 x 3" printed circuit board.
I purchased an AR 2 recently and it works perfectly. One word of caution however; this unit requires a regulated 12 volt power supply. Don't wire it directly to a toy transformer that is unregulated. You will be sending 18 to 20 volts to this unit and it will be damaged. Circuitron also sells a PS 2 regulator which I used to reduce the voltage to 12 and have had no problems. Terrific item and Circuitron offers excellent customer service.
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